The Air/Fuel Ratio Sensor is a high-precision wideband O2 sensor that must be installed in the exhaust. It measures the amount of free oxygen or unburnt fuel present in the exhaust gases, which indicates either a lean or rich condition in the cylinder. Normally this would mount in a standard O2 sensor bung. However, this motorcycle was built long before such technology was available in motorcycles, so it is necessary to add a threaded bung.
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| Spare dented exhaust header to modify with a threaded bung. |
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| Estimating the final location |
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| Marking out the hole |
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| Unmodified threaded sensor bung |
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| Carved down to match the curvature of the exhaust pipe |
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| Drilling the port hole |
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| Tack welded |
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| Welding finished |
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| Ground down and prepared for paint |
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| The rest of the equipment |
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| Wiring the power cord |
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| Rough installation |
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| Sensor cable properly routed |
How did you estimate how far down exhaust pipe to put the sensor?
ReplyDeleteIt is my understanding that you can place the sensor anywhere in the exhaust pipe, as long as there are no leaks between the sensor and the exhaust valve. If any outside air leaks in, it can throw off the reading. Also, they recommend not putting it near the engine because the excessive heat can shorten the lifespan.
ReplyDeleteI put it in that spot because the curved section of the header is double-wall pipe. If I had drilled a hole through double wall, I would have only been able to weld up the outer layer of steel. This would have left a pocket where condensation could build up. These sensors cannot be installed on the bottom of the pipe, or near areas where condensation builds up, because the cooler water can cause a thermal shock when it hits the gauge and cause damage.